Losing e



L. R. DAVIS.

K LAT'HB ,G11-LUCK.

(nudeln.)

,005. Patented June 27, 1882,..-

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UNITED STATES- PATENT OFFICEC LORING It. DAVIS, OF ADRIAN, MICHIGAN,ASSIGNOR OF ONE-HALF TO SYLVESTER I. BABOOOK, OF SAME PLAGE.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 260,005, dated June 27,1882,

Application filed September 20, 1880. (Model.) y

To alt whom it may concern:

Be it known that I, LoRiNe R. Davis, a citizen ofthe United States,residing at Adrian, in the county of Lenawee and State of Michigan, haveinvented certain new and useful Improvements in Lathe-Chucks; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such aswill enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters or gures of reference markedthereon, which form a part of this specification, in which- Figure 1 isa side view of the lathe spindle and chuck; Fig. 2, an end view of thechuck; Fig. 3, a section of chuck and spindle through the line a: .fr ofFig. l; Fig. 4, a rear end view of the chuck-head, showing it chambered5 Fig. 5, a side view of the chuckface-plate separated from the spindle;Fig. 6, detailed views of clamping-plate, its rod, and fastening-plateF; Fig. 7, detailed views of spring, steadyingplate, and back plate.

My invention relates to lathes designed more y especially for jewelersuse or other fine work, although adapted for other turning-lathes;anditconsists in the construction and combination of parts hereinafterdescribed, and sought to be pointed out in the claims, whereby thearticle worked upon can bereadily centered and the parts quickly clampedso as to hold it in position.

In the accompanying drawings, the letter A indicates the head of thechuck, which is chambered from the back, so as to leave a rim, a, on theinside of which is formed a seat, b, against which bears the back plate,B, the outside face of which is liush with the edge of rim a, orpreferably below it, so that the edge of the rim will take the pressureagainst the face-plate hereinafter referred to. This 'plate B isprevented from turning and is held to its seat by means of screwspassing into theplate near its edge, the heads of the screws being cutso as to leave square or sharp edges thereto, which fit against theinside of rim a or into notches that may be made therein.

Inside the chamber of the head A there is placed a conically-coiled orother spring, D, to

the apex or top of which is secured a steadying plate or disk, E. Aclamping-plate, F, of' smaller diameter than the chamber of head A, litsbetween the spring D or its disk and the back plate, B, and to it thereis secured one end of a tightening-rod, G, which passes through anopening, c, somewhat larger in diameter than the rod in the back plate,B, and then through 4a face-plate, H, which is of larger diameter thanthe head of the chuck, the said face-plate being secured fixedly to theend of the hollow spindle I. The end of the tightening-rod is threaded,so that a left-hand nut, J,

may screw thereon and bear against the end Y of the spindle.

The rod G is provided near the back plate, B, with a feather, d, whichlits into a groove, c, formed in the spindle I, so that the rod G willturn with the spindle at the same time that the head A turns with thespindle and face-plate byreason of the head being clamped to theface-plate by screwing down the nut J.

Any of the well-known clamping-jaws suitable for-the purpose are securedto the face of the head A, so as to hold the work. The power of thespring D is such that it will press the clamping-plate F against theback plate, B, with sufficient force as by friction to hold the twoplates together at any point to which the head A may be moved within theradius of the opening c in the back plate.

In operation, after the work-piece has been iixed between theclutch-jaws, the lathe is set in motion and the work centered bypressing against the head of the clutch or the work itself. The nut atthe end of the rod is then screwed up, thereby drawing the head upagainst the face-plate Il, and holding it by pressure tightly againstthat plate, and the work to its center to which it has been adjusted, asdescribed.

If the spring D from any cause should not be able of itself to hold thehead to any adj ustment given to it afterA the work has been clamped inplace, the uut J may be run partially up, so as to give a gentlepressure to the head and permit it to be moved by the workman.

This chuck can be cheaply manufactured. It is simple in construction andnot easily put out of repair, and is very effective in operat- IGO ing,admitting of accurate and quick centering plate, B, and face-plate H,incombination with ofthe work. threaded rod G, provided with plate F andHaving described my inventionmhatIclaini feather d, spindle I, havinggroove e, and left- 15 is hand nut J, the several parts beingarranged 1. In a lathe, the head A, inclosng a spring to operate as setforth. and provided with abaekplate,B,titting below In testimony whereofI aiiix my signature in the edge of rim a, in combination with aclamppresence of two Witnesses. ing-plate, F, located between the springand back plate, and connected to a rod passed LORING R' DAVI' through alwiow spindle and operated on by a nut, substantially as set forth.

2. In a lat-he, the head A, spring D, back I IVitnesses ORSAMUS LAMB, J.E. SCHNELL.

